Abstract:
:LBR (lamin B receptor) is an integral protein of the inner nuclear membrane encoded by a gene on human chromosome 1q42.1. LBR has a nucleoplasmic, amino-terminal domain of approximately 200 amino acids followed by a carboxyl-terminal domain similar in sequence to yeast and plant sterol reductases. We have determined the primary structures of two human proteins with strong sequence similarity to the carboxyl-terminal domain of LBR and sterol reductases. Their genes have recently been assigned the symbols TM7SF2 and DHCR7. TM7SF2 mRNA is most predominantly expressed in heart and DHCR7 mRNA mostly in liver and brain. Whereas LBR is localized to the inner nuclear membrane, these two related proteins are in the endoplasmic reticulum. The TM7SF2 gene contains 10 coding exons, and its intron positions are exactly conserved in the part of the LBR gene encoding its carboxyl-terminal domain. Intron positions in the DHCR7 gene are also similar. Both of these new LBR-like genes are on chromosome 11q13. These results describe a human gene family encoding proteins of the inner nuclear membrane and endoplasmic reticulum that function in nuclear organization and/or sterol metabolism.
journal_name
Genomicsjournal_title
Genomicsauthors
Holmer L,Pezhman A,Worman HJdoi
10.1006/geno.1998.5615subject
Has Abstractpub_date
1998-12-15 00:00:00pages
469-76issue
3eissn
0888-7543issn
1089-8646pii
S0888-7543(98)95615-4journal_volume
54pub_type
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